If nursing is something you really want to do, then nothing should hold you back from it. Do some research, figure out where you would go to school, how you would pay for it (grants, loans, scholarships, etc.), what sort of schedule you would have with classes, etc. Would you be able to work full-time while you go to school (many here do it) since from your post it seems you are the primary source of income for your family (correct me if I'm wrong; shooting from the hip here)? If you become pregnant (since you said you were trying to have another baby) would you still be willing to take classes (many do; many don't; I didn't and took a year and a half off when I got pregnant with my son. He'll be 1 on Saturday and I just started my first semester of nursing classes after going part-time for pre-reqs for what seems forever now) ?
Whatever you decide, don't base your decision on your age. That is IRRELEVANT when it comes to nursing school!
Do some soul searching and make your choice. In the meantime, hang out here and "listen" to all of us; maybe we'll get you motivated.
Good luck to you, and keep us posted!
(Pardon my rambling posts; my train of thought runs me right off the page sometimes)